Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c13468902bd1b88…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 11:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 51b3fbb9b58a5f00dadd72b64a106857 SHA-1: 0ea33830e3c5f9ed9942d2cda7af711800e117fd SHA-256: 9c13468902bd1b8829ac2483d488086a400ee22f3b31f162c7f54ec68f24dd07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains multiple URLs pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9684f2a06---boletedafisatu.pdf In PDF document text
    • http://www.dereformasenalicante.com/archivos/files/vevosupibukizopuge.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/wirimisubobosuruwewoz.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247745fd8a---kamujesezukivawemife.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6bdf32ddc---gakasowonojopebawepogojip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf60f008d---64942874219.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/56844026949.pdfIn PDF document text
    • https://airshow-bg.com/file/mozajagiti.pdfIn PDF document text
    • http://houselandia.ru/files/goliragit.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/zorodokesujebedenuwegokej.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/mamot.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073968691705---juwijujuxu.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/68350389265.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/70fe81e4c1e49d92a26992894f34027d/94208549357.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/bee4gcfn4gjlust5tvkhg3sfoj/zagatewopepifujope.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/46906515997.pdfIn PDF document text
    • http://cpbnatation.fr/fckeditor/userfiles/file/31889181078.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160d6b17947b6c---nojuduzupekamudare.pdfIn PDF document text
    • http://moneymaker-gold.de/files/bubetiwo.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/84004880727.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/fepusi.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/80009930153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=halo+bassinest+essentia+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3ED 17632 bytes
SHA-256: e2fed3a4d45a15bbfe15b06e7e9545e21866c4ca529956d12a3c3e9fb7ea52f3
font_02_sfnt_off00012217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 10400 bytes
SHA-256: b712bcf8d6f94a710ee436bf368a60f4aea56c53d21e4b5e97678125d1bec597

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